You selected Dahlia astrantiaeflora (Sweet) G.Don. This is a synonym for:

Accepted scientific name:
Dahlia pinnata Cav. (provisionally accepted name)
Synonyms:
Bidens variabilis (Desf.) Baill. (synonym)
Coreopsis crassifolia Sessé & Moc. (synonym)
Coreopsis georgina Cass. (synonym)
Dahlia astrantiaeflora (Sweet) G.Don (synonym)
Dahlia hybrida (synonym)
Dahlia nana Andrews (synonym)
Dahlia purpurea (Willd.) Poir. (synonym)
Dahlia pusilla Zucc. ex DC. (synonym)
Dahlia rosea Cav. (synonym)
Dahlia royleana Knowles & Westc. (synonym)
Dahlia sambucifolia Salisb. (synonym)
Dahlia sphondyliifolia Salisb. (synonym)
Dahlia superflua (DC.) W.T.Aiton (synonym)
Dahlia variabilis (Willd.) Desf. (synonym)
Georgia superflua DC. (synonym)
Georgia variabilis (Willd.) Spreng. (synonym)
Georgina astrantiaeflota Sweet (synonym)
Georgina purpurea Willd. (synonym)
Georgina rosea (Cav.) Willd. (synonym)
Georgina superflua DC. (synonym)
Georgina variabilis Willd. (synonym)
Common names: -
Classification:
Plantae
Phylum Magnoliophyta
Class Magnoliopsida
Order Asterales
Family Asteraceae
Genus Dahlia
Distribution: 7 - Northern America, ; 3 - Asia-Temperate, 36 - China, ; 3 - Asia-Temperate, 36 - China, ; 7 - Northern America, 79 - Mexico, ; 7 - Northern America, 79 - Mexico, ; 7 - Northern America, 79 - Mexico, ; 8 - Southern America, 85 - Southern South America, ; 8 - Southern America, 85 - Southern South America, Argentina Northwest (AGW), ; 8 - Southern America, 80 - Central America, Belize (BLZ), ; 4 - Asia-Tropical, 40 - Indian Subcontinent, India (IND), ; 4 - Asia-Tropical, 40 - Indian Subcontinent, India (IND), ; 3 - Asia-Temperate, 38 - Eastern Asia, Japan (JAP), ; 3 - Asia-Temperate, 38 - Eastern Asia, Korea (KOR), ; 7 - Northern America, 79 - Mexico, Mexico Central (MXC), ; 7 - Northern America, 79 - Mexico, Mexico Northeast (MXE), ; 7 - Northern America, 79 - Mexico, Mexico Southwest (MXS), ; 4 - Asia-Tropical, 41 - Indo-China, Vietnam (VIE), ; 8 - Southern America, 85 - Southern South America, Argentina Northwest (AGW), Salta (AGW-SA); 4 - Asia-Tropical, 40 - Indian Subcontinent, Assam (ASS), Assam (ASS-AS); 4 - Asia-Tropical, 40 - Indian Subcontinent, Assam (ASS), Manipur (ASS-MA); 4 - Asia-Tropical, 40 - Indian Subcontinent, Assam (ASS), Tripura (ASS-TR); 1 - Europe, 12 - Southwestern Europe, Baleares (BAL), Baleares (BAL-OO); 1 - Europe, 11 - Middle Europe, Belgium (BGM), Belgium (BGM-BE); 1 - Europe, 14 - Eastern Europe, Belarus (BLR), Belarus (BLR-OO); 1 - Europe, 14 - Eastern Europe, Baltic States (BLT), Estonia (BLT-ES); 1 - Europe, 14 - Eastern Europe, Baltic States (BLT), Latvia (BLT-LA); 1 - Europe, 14 - Eastern Europe, Baltic States (BLT), Lithuania (BLT-LI); 8 - Southern America, 80 - Central America, Belize (BLZ), Belize (BLZ-OO); 1 - Europe, 13 - Southeastern Europe, Bulgaria (BUL), Bulgaria (BUL-OO); 4 - Asia-Tropical, 41 - Indo-China, Cambodia (CBD), Cambodia (CBD-OO); 3 - Asia-Temperate, 36 - China, China South-Central (CHC), Yunnan (CHC-YN); 3 - Asia-Temperate, 36 - China, China Southeast (CHS), Guangdong (CHS-GD); 3 - Asia-Temperate, 36 - China, China Southeast (CHS), Jiangsu (CHS-JS); 8 - Southern America, 83 - Western South America, Ecuador (ECU), Ecuador (ECU-OO); 6 - Pacific, 60 - Southwestern Pacific, Fiji (FIJ), Fiji (FIJ-OO); 1 - Europe, 11 - Middle Europe, Germany (GER), Germany (GER-OO); 1 - Europe, 10 - Northern Europe, Great Britain (GRB), Great Britain (GRB-OO); 8 - Southern America, 80 - Central America, Guatemala (GUA), Guatemala (GUA-OO); 8 - Southern America, 80 - Central America, Honduras (HON), Honduras (HON-OO); 1 - Europe, 11 - Middle Europe, Hungary (HUN), Hungary (HUN-OO); 4 - Asia-Tropical, 40 - Indian Subcontinent, India (IND), Karnataka (IND-KT); 4 - Asia-Tropical, 40 - Indian Subcontinent, India (IND), Maharashtra (IND-MR); 1 - Europe, 10 - Northern Europe, Ireland (IRE), Ireland (IRE-IR); 1 - Europe, 13 - Southeastern Europe, Italy (ITA), Italy (ITA-IT); 1 - Europe, 13 - Southeastern Europe, Italy (ITA), San Marino (ITA-SM); 1 - Europe, 13 - Southeastern Europe, Italy (ITA), Vatican City (ITA-VC); 1 - Europe, 14 - Eastern Europe, Krym (KRY), Krym (KRY-OO); 4 - Asia-Tropical, 41 - Indo-China, Laos (LAO), Laos (LAO-OO); 4 - Asia-Tropical, 42 - Malesia, Maluku (MOL), Maluku (MOL-OO); 7 - Northern America, 78 - Southeastern U.S.A., Mississippi (MSI), Mississippi (MSI-OO); 4 - Asia-Tropical, 41 - Indo-China, Myanmar (MYA), Myanmar (MYA-OO); 7 - Northern America, 78 - Southeastern U.S.A., North Carolina (NCA), North Carolina (NCA-OO); 6 - Pacific, 60 - Southwestern Pacific, Niue (NUE), Niue (NUE-OO); 8 - Southern America, 80 - Central America, Panamá (PAN), Panamá (PAN-OO); 1 - Europe, 11 - Middle Europe, Poland (POL), Poland (POL-OO); 1 - Europe, 12 - Southwestern Europe, Portugal (POR), Portugal (POR-OO); 5 - Australasia, 50 - Australia, Queensland (QLD), Queensland (QLD-QU); 5 - Australasia, 50 - Australia, Queensland (QLD), Queensland (QLD-QU); 1 - Europe, 13 - Southeastern Europe, Romania (ROM), Romania (ROM-OO); 1 - Europe, 12 - Southwestern Europe, Spain (SPA), Andorra (SPA-AN); 1 - Europe, 12 - Southwestern Europe, Spain (SPA), Gilbraltar (SPA-GI); 1 - Europe, 12 - Southwestern Europe, Spain (SPA), Spain (SPA-SP); 3 - Asia-Temperate, 33 - Caucasus, Transcaucasus (TCS), Azerbaijan (TCS-AZ); 4 - Asia-Tropical, 41 - Indo-China, Thailand (THA), Thailand (THA-OO); 1 - Europe, 14 - Eastern Europe, Ukraine (UKR), Moldova (UKR-MO); 1 - Europe, 14 - Eastern Europe, Ukraine (UKR), Ukraine (UKR-UK); 1 - Europe, 13 - Southeastern Europe, Yugoslavia (YUG), Bosnia-Herzegovina (YUG-BH); 1 - Europe, 13 - Southeastern Europe, Yugoslavia (YUG), Serbia (YUG-SE);
Additional data: Data Providers: CONABIO, LCR Editor, Flora of the West Indies, New Zealand Plant Name Database, Flora of Korea, Govaerts World Compositae Checklist A-G, IPNI, Panama Checklist, MesoAmericana, Flora of China Project, Tropicos, Euro+Med, Colombia Checklist, Vietnam Flora, Queensland Census, Preliminary Checklist of North American Compositae, Flora del Conosur, Vascular Plants of Russia, Pacific - Fiji, Pacific - Nuie Brider, Naturalised Australian Asteraceae, India. GCC LSID: urn:lsid:compositae.org:names:F0F0B9F0-6428-4821-93F7-26EB950A9837
Source database: GCC, 2 (Beta), Nov 2010
Latest taxonomic scrutiny: Flann C., 07-Oct-2010
Online resource: http://compositae.landcareresearch.co.nz/default.aspx?Page=NameDetails&TabNum=0&NameId=F0F0B9F0-6428-4821-93F7-26EB950A9837
CoL taxon LSID: urn:lsid:catalogueoflife.org:taxon:d06830cf-2dc5-11e0-98c6-2ce70255a436:col20110201